I had a situation a while back where a loose donk put in 90% of his stack on the river when I had the nuts. I shoved and he reluctantly called, I took it down and he left. I thought it would have probably been better to just leave him a couple of bucks and maybe he'll double up, or reload after a couple of hands more. A lot of people just leave after loosing their whole buy in. I think they're more likely to reload if you leave them some chips and let them cool down.